We tested this feature with over 220,000 customers across different types of businesses and found that displaying a translated Checkout converts significantly better for many companies—in particular, where the rest of their website is translated. For those sites, revenue from non-English speakers increased by between 7 and 12 percent—a huge jump for one tiny checkout change.

Based on our results, we strongly recommend you enable this feature if you already have a website in the eight languages we currently support.

You can opt in to using the translated version with a single line of code. If you’re using the simple integration, just pass data-locale="auto" into the <script> tag. If you have a custom integration, use locale: 'auto' when calling StripeCheckout.configure(). There’s more info in the docs.

This change illustrates part of our broader goal with Checkout: to deliver a constant stream of refinements that automatically improve your checkout flow and help you reach more customers.

If you notice anything surprising, or have questions or feedback, please let me know!